Put a new advance curve kit in the distributor. Old one seemed fine but the idle wouldn't always drop down to where it should be. Had a hell of a time adjusting the timing, guess I need to put in heavier springs. Seems like the advance was coming in at idle which made it harder to adjust. Not today though, in the 80's and a lot hotter than that in garage, leaning over a big block.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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